[hobbit] UDP Ports

[Barrett, Tony]

Morsiani, Massimo wrote:
> Hi,
> 
> take a look at http://www.trantor.org/theshire/doku.php/monitors:dhcp.
> It's a custom script based on dhcping.
> 
> 
> Regards.
> 
> Massimo Morsiani
> Information Technology Dept.
> ------
> Gilbarco S.p.a.
> via de' Cattani, 220/G
> 50145 Firenze
> tel:	+39-055-30941
> fax:	+39-055-318603
> email:	massimo.morsiani at gilbarco.com
> web:	http://www.gilbarco.it
> 
> 
> -----Original Message-----
> From: Henrik Stoerner [mailto:henrik at hswn.dk]
> Sent: giovedì 3 maggio 2007 17.50
> To: hobbit at hswn.dk
> Subject: Re: [hobbit] UDP Ports
> 
> On Thu, May 03, 2007 at 04:45:13PM +0100, Barrett, Tony wrote:
>> Is there any way I can monitor UDP ports within bb-services? Hobbit
>> seems to assume all ports are TCP, and I'd like to run a port test
>> against our DHCP servers here to make sure they're responding ok.
> 
> Hobbit doesn't have support for UDP protocols built in, since these
> use mostly binary data - SNMP, DNS, DHCP, NFS and NTP are probably
> the most commonly used UDP-based protocols, and they all carry date
> in a binary format, unlike the popular TCP-based protocols.   
> 
> And unlike TCP, the UDP-based protocols do not have a generic
> "handshake" that you can use to check if the service is running. 
> 
> My best suggestion is to use the tool called "dhcping" to check your
> DHCP servers. It requires some special setup on the DHCP server side,
> but once you have it working then creating a custom test script to
> run it and report the status to Hobbit should be very simple.   
> 
> 
> Regards,
> Henrik
> 
> 
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Massimo, I found a couple of small problems with this script. First, it was developed on Solaris, and uses ptime to measure execution time. Linux doesn't have ptime, just 'time' and I'm not sure if it's giving the correct response for script post-processing. I get some strange output;

  DHCP query succeeded
 
no answer
Command exited with non-zero status 1
0.00user 0.00system 0:10.00elapsed 0%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+191minor)pagefaults 0swaps
 
Seconds: 0

Hobbit though, thinks the connection has been successful, even though the script returns status 1 (no answer), and shows the link as green.

Secondly, the script seems to have been developed with a single DHCP server in mind. We use split DHCP servers that each lease a different range in a global scope, which means I cannot test both DHCP servers from the same script.


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